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J Appl Physiol (December 13, 2002). doi:10.1152/japplphysiol.01032.2002
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Articles in PresS, published online ahead of print December 13, 2002
J Appl Physiol, 10.1152/jap.01032.2002
Submitted on November 12, 2002
Accepted on December 6, 2002

Effects of Paranasal Sinus Ostia and Volume on Acoustic Rhinometry Measurements: A Model Study

Ozcan Cakmak1*, Huseyin Celik2, Mehmet Cankurtaran2, Fuat Buyuklu1, Nuri Ozgirgin1, and Levent Naci Ozluoglu1

1 Faculty of Medicine, Department of Otorhinolaryngology, Baskent University, Ankara, Turkey
2 Faculty of Engineering, Department of Physics, Hacettepe University, Ankara, Turkey

* To whom correspondence should be addressed. E-mail: ozcakmak{at}hotmail.com.

We used pipe models to investigate the effects of paranasal sinus ostium size and paranasal sinus volume on the area-distance curves derived by acoustic rhinometry (AR). Each model had a Helmholtz resonator or a short neck as a side branch, simulating the paranasal sinus and sinus ostium. The AR-derived cross-sectional areas posterior to the ostium were significantly overestimated. Sinus volume affected the AR measurements only when the sinus was connected via a relatively large ostium. The experimental area-distance curve posterior to the side branch showed pronounced oscillations in association with low-frequency acoustic resonances in this distal part of the pipe. The experimental results are discussed in terms of theoretically calculated sound-power reflection coefficients for the pipe models used. The results indicate that the effects of paranasal sinuses and low-frequency acoustic resonances in the posterior part of the nasal cavity are not accounted for in the current AR algorithms. AR does not provide reliable information about sinus ostium size, sinus volume, or cross-sectional area in the distal parts of nasal cavity.




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